Deflection yoke

ABSTRACT

A deflection yoke wherein a resilient connecting arm is extended to an enlarged front portion of a horizontal deflection coil from opposite sides of a flange portion provided at the rear end, and insulating mount frames each to be mounted on the opposite sides of the horizontal deflection coil are provided at the extended end of the connecting arm, to which a rotating corrective magnet is secured.

United States Patent [72] Inventor Koji Yabase Tokyo, Japan [21] Appl. No. 30,549

[22] Filed Apr. 21, 1970 [45] Patented Nov. 16, 1971 [73} Assignee Denki Onkyo Co., Ltd.

Tokyo, Japan [32] Priority Apr. 24, 1969 [33] Japan [54] DEFLECTION YOKE Primary Examiner-43. Harris Attorney-McClew and Toren ABSTRACT: A deflection yoke wherein a resilient connecting 3 Chums 5 Drawmg arm is extended to an enlarged front portion of a horizontal [52] U.S.Cl 335/212, deflection coil from opposite sides of a flange portion pro- 313/76 vided at the rear end, and insulating mount frames each to be [51] Int. Cl 110" 1/00 mounted on the opposite sides of the horizontal deflection coil [50] Field 01 Search 335/210, are provided at the extended end of the connecting arm, to

212, 213, 75, 76, 77 which a rotating corrective magnet is secured.

DEFLECTION YOKE BACKGROUND OF THE INVENTION This invention relates to deflection yoke of the type which does not use any bobbin between vertical and horizontal deflection coils like a transistor-type deflection yoke.

In the prior art deflection yoke of this kind, it has been impossible to mount a rotating corrective magnet because of the absence of a bobbin. In the deflection yoke of this kind, therefore, bar magnets have been secured to opposite sides of the horizontal deflection coil by adhesive material, adhesive tape or the like to thereby adjust the deflection magnetic field. However, where bar magnets are to be used as described above, there exist disadvantages in that mounting of the bar magnets during the assembly of the products is troublesome, the deflection magnetic field cannot be adjusted as desired and the fine adjust of the magnetic field cannot be attained.

SUMMARY OF THE INVENTION It is, therefore, an object of this invention to allow the deflection magnetic field to be adjusted at any desired time in the deflection yoke of the type mentioned above by mounting rotating corrective magnets at opposite sides of the horizontal deflection coil.

It is another object of this invention to precisely adjust the deflection magnetic field by the rotating corrective magnets mounted on the horizontal deflection coil.

It is a further object of this invention to simplify the mounting operation of the magnets during the assembly of the products by securing the corrective magnets to the mounting frame mounted onto the horizontal deflection coil.

It is a still further object of this invention to improve contact of the mounting frame to the horizontal deflection coil and simplify the securing operation of the mounting frame to the horizontal deflection coil by interconnecting the mounting frame 'with the rear flange portion through the resilient connecting arm.

According to a preferred embodiment of this invention, the deflection yoke comprises a pair of vertical deflection coils troidal-wound on a core, a pair of horizontal deflection coils mounted in the core, a flange portion provided at rear ends of the deflection coils, a pair of resilient connecting arms extending from the flange portion, a pair of mounting frames of nonmagnetic material provided at the connecting arms and fitted to the front enlarged edges of the horizontal deflection coils, and a pair of rotatable cylindrical magnets mounted on the mounting frames.

BRIEF DESCRIPTION OF THE DRAWINGS These and other objects together with advantages and features of this invention will become apparent and this invention will be better understood from the following description, reference being made to the accompanying drawings, in which:

FIG. 1 is a plan view of the deflection yoke according to this invention;

FIG. 2 is a front elevational view of the deflection yoke of FIG. 1;

FIG. 3 is a rear elevational view of the deflection yoke of FIG. 1;

FIG. 4 is a plan view of the rear flange portion and the mounting frame incorporated in the deflection yoke of this invention; and

FIG. 5 is a front elevational view of the horizontal deflection coil to be used in the deflection yoke of this invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGS. 1, 2, 3 and 4 of the accompanying drawings, the deflection yoke is shown to include a deflection yoke body and a hollow insulating flange portion mounted to the rear portion of the body 10. The deflection yoke body 10 comprises a pair of vertical deflection coils 11,

ll troidal-wound on the core 12 and a pair of horizontal deflection coils 13, 13 of saddle type mounted within the core 12, the horizontal deflection coils 13 having their rear ends accommodated in the inside of the flange portion 20 while the front enlarged edges 13a being assembled to protrude from the core 12. The flange portion 20 has its horizontal diameter d1 smaller than the diameter d2 (shown in FIG. 5) of the horizontal d coils l3 and is formed by joining two halves 21, 21 as shown in FIG. 4.

Mounted on opposite sides of the flange portion 20 are a pair of resilient connecting arms 30, 30 extending outwardly of the horizontal deflection coils l3, and insulating mounting frames 40, 40 laterally fitted to the enlarged edges 13a, 13a of the horizontal deflection coils l3, 13 are provided at the ends of the connecting arms. The connecting arms 30, 30 are opposed to each other leaving the gap W smaller than the diameter d2 of the horizontal deflection coils 13, 13 so that when the mounting frames 40, 40 are fitted to the enlarged edges of the horizontal deflection coils l3, 13 the arms are forced toward each other, said gap being formed by extending the connecting arms 30, 30 outwardly of the side edges 22, 22 of the flange portion 20 in parallel to each other. Provided on each of the mounting frames 40, 40 are a elongated curved surface 41 of arcuate shape to be brought into contact with the enlarged edges 13a of the horizontal deflection coils 13, an arcuate wall surface 42 formed at the rear end of said curved surface to be attached to the rear surfaces of the enlarged edges 13a and a stop surface 43 fonned at the front end of said curved surface 41 to face with said arcuate wall surface. By the channellike space formed by the curved surface 41 and the wall surface 42 and the stop surface 43, the enlarged edges 13a of the horizontal deflection coils 13 are closely fitted.

On the curved surface 41 of each of the mounting frame 40, two elongated support anns 60, 60 of magnetic material are attached serially, by adhesive material or the like, circumferentially of the horizontal deflection coils 13, 13. The supporting arms 60, 60 have their ends 61, 61 faced to each other at opposite horizontal sides of the horizontal deflection coils I3, 13, the ends 61, 61 being bent in arcuate shape toward each other to form a circular holding portion 62.

Mounted on the curved surface 41 of each of the mounting frames is a rotating corrective magnet of cylindrical shape which is rotatably mounted by the holding portion 62 formed by the supporting arms 60, 60 and which is positioned in place within the holding portion by a fixing spring member 63, said magnet being magnetized diametrically and has an aperture 71 punched at the center thereof in to which tools such as a screwdriver can be inserted. As in the prior art device a suitable number of clamp segments 23, 23,...are provided at the flange portion 20 along the outer wall of the neck of a television picture tube, the clamping segments each having a clamp belt 24 mounted thereon. As shown in FIG. 4, the mounting frames 40, 40 are preferably inclined inwardly of the connecting arms so that when the connecting arms are expanded to match the enlarged edges of the horizontal deflection coils they may be easily fitted to the enlarged edges of the horizontal deflection coils. They may be brought into parallel with the flange portion.

As will be understood from the foregoing description of this invention, since the mounting frames 40, 40 of the present in vention fitted to the enlarged edges of the horizontal deflection coils 13, 13 are positioned in place by spring force of the connecting arms 30, 30 directed toward the center axis and secured by adhesive material or the like, the operation to mount the mounting frames to the horizontal deflection coils becomes very simple, and since the flange portion 20 is secured to the deflection yoke body 10 and the mounting frames are fitted to the horizontal deflection coils, the operation becomes effective. Furthermore, since the rotating corrective magnets can be used it becomes possible to adjust the deflection magnet field.

Although the invention has been described with reference to certain specific embodiments it will be obvious to those skilled in the art that it is not so limited but is susceptible to various changes and modifications without departing from the spirit thereof.

Having described the invention, what is claimed is:

l. A deflection yoke comprising a core having a pair of vertical deflection coils toroidal-wound thereon, a pair of saddleshaped horizontal deflection coils fitted in said core having their enlarged ends protruded to the core front and having other ends protruded to the core back, an insulating flange portion secured to the rear portion of said core for accommodating the rear ends of said horizontal deflection coils, a pair of resilient connecting arms extending outwardly of the opposite sides of said horizontal deflection coil from said flange portion, a pair of mounting frames provided at the extended ends of said connecting arms and mounted to the enlarged end of said horizontal deflection coils through spring force of the connecting arms so that the frames are positioned on both horizontal sides of the horizontal deflection coils, supporting arms of magnetic material secured to said mounting frames, and cylindrical magnets rotatabiy supported by said supporting arms and magnetized diametrically.

2. A deflection yoke according to the claim 1 wherein the space between the connecting arms is smaller than the diameter of said horizontal deflection coil.

3. A deflection yoke according to claim 1 wherein each of said mounting frames comprises a curved surface closely contacting to the enlarged edges of the horizontal deflection coils, a wall surface formed at the rear end of said curved surface so as to be secured to the rear surfaces of the enlarged edges, and a stop surface formed at the front ends of the enlarged edges so as to be pressed on to the front surfaces of the enlarged edges facing to said wall surface.

* t II 

1. A deflection yoke comprising a core having a pair of vertical deflection coils toroidal-wound thereon, a pair of saddle-shaped horizontal deflection coils fitted in said core having their enlarged ends protruded to the core front and having other ends protruded to the core back, an insulating flange portion secured to the rear portion of said core for accommodating the rear ends of said horizontal deflection coils, a pair of resilient connecting arms extending outwardly of the opposite sides of said horizontal deflection coil from said flange portion, a pair of mounting frames provided at the extended ends of said connecting arms and mounted to the enlarged end of said horizontal deflection coils through spring force of the connecting arms so that the frames are positioned on both horizontal sides of the horizontal deflection coils, supporting arms of magnetic material secured to said mounting frames, and cylindrical magnets rotatably supported by said supporting arms and magnetized diametrically.
 2. A deflection yoke according to the claim 1 wherein the space between the connecting arms is smaller than the diameter of said horizontal deflection coil.
 3. A deflection yoke according to claim 1 wherein each of said mounting frames comprises a curved surface closely contacting to the enlarged edges of the horizontal deflection coils, a wall surface formed at the rear end of said curved surface so as to be secured to the rear surfaces of the enlarged edges, and a stop surface formed at the front ends of the enlarged edges so as to be pressed on to the front surfaces of the enlarged edges facing to said wall surface. 